Design of a New Relieving-DC-Saturation Hybrid Reluctance Machine for Fault-Tolerant In-Wheel Direct Drive

Xing Zhao, Shuangxia Niu, Xiaodong Zhang, Weinong Fu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

31 Citations (Scopus)


This article aims to propose a new hybrid reluctance machine equipped with relieving-dc-saturation (RDCS) ability for electric vehicle in-wheel drive. The proposed machine uses integrated ac and dc current excitation to eliminate extra dc field coils for the efficient torque generation. Besides, considering the inherent dc saturation in stator core caused by dc current excitation, slot PMs are artificially introduced to provide RDCS effect and thus boost torque density. Moreover, with a modular magnetic field configuration, the proposed topology exhibits excellent fault-tolerant potential at both open-circuit and short-circuit condition, making it suitable for safety-critical in-wheel vehicle propulsion. In this article, the machine configuration and operation principle are introduced, with emphasis on its RDCS effect and corresponding design consideration. Further, performance of this new topology is evaluated by both finite element analysis and prototype experiments. It is revealed that, with this RDCS ability, torque density of the proposed machine can be enhanced by about 25% under relatively high current density.

Original languageEnglish
Article number8917799
Pages (from-to)9571-9581
Number of pages11
JournalIEEE Transactions on Industrial Electronics
Issue number11
Publication statusPublished - Nov 2020


  • DC saturation effect
  • hybrid reluctance machine (HRM)
  • integrated current excitation
  • modular magnetic field
  • slot PMs

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


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